Paper tube and method of making the same.



,C. S. BIRD PAPER TUBE AND METHOD OF MAKING THE SAME. APPLlCATiON FILED JULYH, 1913 RENEWED AUG. 31. 1915.

Patented Oct. 26, 1915.

CHARLES S. BIRD, 0F WALPOLE, MASSACHUSETTS.

PAPER TUBE AND METHOD OF MAKING THE SAME.

' Specification of Letters Patent.

Patented Met. 26, rare.

Application filed July 11, 1913, Serial No. 778,582. Renewed August 31, 1915. Serial No: 48,347..

To all whom it may concern Be it known that I, CHARLES S. BIRD, a citizen of the United States, residing at Walpole, in the county of Nonfolk and State of Massachusetts, have invented certain new and useful Improvements in Paper nexed drawings, wherein:

Figure 1 is a perspective view of the blank from which the tube is formed; and Fig. 2 a similar view of the tube.

In the production of paper tubes (especially tubes which are adapted for use in the manufacture of paper shot shells) it is necessary that thetubeshal] be of substantially uniform diameter throughout, shall present a smooth and even surface, that the surface shall be waterproof, or non-absorptive, and it is likewise desirable in order to make a salable and attractive article, that,

the color shall appear the same, or sub-stantially the same, over the entire outer surface or face of the tube.

The object of the present invention is to produce such a tube, and by employing the method hereinafter set forth such object is accomplished;

The tube may be formed'from a blank or sheet, made. in accordance with Letters Patent numbered 696,131, granted to me under date of March 25, 1902, the sheet,' however, preferably having, both edges thinned or brought to a feather edge, so that when the sheet is rolled in tubular form it will not 1 present any perceptible thickened portions.

is shown in Fig. 1, and comprises a sheetof paper which, of course, is more oi' less absorptive, the main portion thereof being designated by 1, and the remainder by 2, the latter being colored or not as may be desired. The edges of the sheet, as at 3 and 4, as above noted, will preferably be thinned or tapered to a thin or feather edge, so that when the sheet is rolled into tubular form it will not present any perceptible thickened portlon nor any projecting edge or shoulder upon its interior or exterior where the edges of the sheet terminate. The completed tube is shown in Fig. 2, wherein 1 designates the body of the blank which forms the main portion of the tube. The outer colored surface is designated in said figure by 2, but owing to thefact that the edges 3 and 4 are thin and merge into the tube it is impossible to show the same inthis figure. 1 i

In my copending application filed on or about July 11, 1912, Serial No. 708,843 (now Letters Patent No. 1,074,926, issued under having'a Waterproof surface presenting an even color and in addition to the method have claimed broadly a tube so made, the method in that instance bringing in the step of waterproofing, independent of the filling of the surface of the paper, or of thetube,

and also the coloring.thereof. Under the presentinethod the filler maybe of such a nature as to produce a substantially waterproof surface when such surface is burnished, and may likewise act as or carry the pigment necessary to produce-thej'desired color. Thus, if a tube having the'natural color of the paper of which it is formed be desired, I will treat the outer; surface of the tube, or that'portionof the sheet which will ultimately appear as the outer surface of the tube, with a coating, such for instance, as china clay, blanc fiXe, or the like, mixed. with glue, which coating may be subjected to the action of formaldehyde, which tends to harden the glue. Or, if it be desired that the outer face or surface of the tube be colored differently, or more deeply, from that which would be produced by the paper itself, the filler' (china clay, blanctfixe, or the like) may be mixed with a pigment in addition to the glue, or a colored clay may be employed in lieu of a pigment.

When the surface of the tube thus treated is burnished it will be found to'present an even color, and likewise will be smooth, two

requisites to a commercial tube. The employment of the filler is also of great advantage in that it prevents the roughening up of the surface of the tube. The surface will also be waterproof to a greater or less extent, dependent upon the nature of the clay or other inert filler employed, and the glue, casein, or other like material which is employed therewith to cause the clay or the like to adhere to the paper or outer face of the tube. axes or wax soaps may also be added to the coating, in order that a better finish may be obtained.

\Vhat I claim and desire to secure by Letters Patent is:

1. As a new article of manufacture, a paper tube the outer face whereof is filled with a waterproofing filler and burnished, said filler being characterized by the fact that it does not present a greasy feel or surface when subjected to heat.

2. As a new article of manufacture, a paper tube the outer face whereof only is filled with an inherently waterproofing colored filler.

3. As anew article of manufacture, a paper tube the cutter surface whereof is filled with an inert waterproofing filler charged with a pigment, said filler being characterized by the fact that it does not, when subjected to heat, present a greasy surface.

4. As a new article of manufacture, a paper tube the outer surface of which is filled with blanc fixe, and burnished.

5. As a new article of manufacture, a paper tube the outer surface of which is filled with blanc fixe and a suitable pigment, and burnished.

6. As a new article of manufacture, a paper tube the outer surface of which is filled with a mixture composed of blanc fixe and a suitable adhesive, and burnished.

7. The method of making paper tubes, which consists in applying to the outer face thereof a filler composed of an earthy material and an adhesiy e waterproofing vehicle therefor; and finally burnishing the same.

8. The method of making paper tubes, which consists in applying to the outer face thereof a waterproof filling compound; and finally burnishing the same.

9. The method of making paper tubes, which consists in applying to the outer face thereof a waterproofing filling compound composed of blanc fixe, an adhesive vehicle and a pigment; and finally burnishing the same.

10. The method of making paper tubes, which consists in applying to the outer face thereof a waterproofing filling compound composed of earthy material and an adhesive vehicle; subjecting the tube thus treated to the action of an agent which will harden the adhesive vehicle; and finally burnishing the tube.

11. The method of making paper tubes, which consists in applying to the outer face thereof a waterproofing filling compound composed of blanc fixe and glue; subjecting the tube thus treated to the action of formaldehyde; and finally burnishing the surface thereof.

12. The method of making paper tubes, which consists in applying to the outer face thereof a filling compound composed of blanc fixe, a suitable pigment, and glue; subjecting the surface thus treated to the action of formaldehyde; and finally burnishing the surface.

13. The method of making paper tubes, which consists in treating the tube with a mixture susceptible of conversion into a substantially waterproof state; converting the same into such waterproof condition; and finally burnishing the tube.

14. The method of making paper tubes, which consists in treating the tube with amixture susceptible of conversion into a substantially waterproof state, said mixture containing as an ingredient wax or wax soap; converting said mixture into a waterproof state; and finally burnishing the tube.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

CHARLES S. BIRD.

Witnesses H. H. MILLER, M. M. Rules. 

